The Parson Russell Terrier is a breed of small white terrier that was the original Fox Terrier of the 18th century. The breed is named after the person credited with the creation of this type of dog, the Reverend John "Jack" Russell. It is the recognised conformation show variety of the Jack Russell Terrier and was first recognised in 1990 in the United Kingdom as the Parson Russell Terrier. In America, it was first recognised as the Jack Russell Terrier in 1997. The name was changed to its current form in 1999 in the UK and by 2008 all international kennel clubs recognised it under the new name.
A mostly white breed with either a smooth, rough or broken coat, it conforms to a narrower range of sizes than the Jack Russell. It is a feisty, energetic terrier, suited to sports and able to get along with children and other animals. It has a range of breed-related health issues, mainly relating to eye disorders.